1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/* $OpenBSD: vm_unix.c,v 1.3 1997/03/29 21:17:17 tholo Exp $ */
/* $NetBSD: vm_unix.c,v 1.19 1996/02/10 00:08:14 christos Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
*
* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
*/
/*
* Traditional sbrk/grow interface to VM
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <sys/core.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <vm/vm.h>
/* ARGSUSED */
int
sys_obreak(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_obreak_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
register struct vmspace *vm = p->p_vmspace;
vm_offset_t new, old;
int rv;
register int diff;
old = (vm_offset_t)vm->vm_daddr;
new = round_page(SCARG(uap, nsize));
if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
return(ENOMEM);
old = round_page(old + ctob(vm->vm_dsize));
diff = new - old;
if (diff > 0) {
rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
if (rv != KERN_SUCCESS) {
uprintf("sbrk: grow failed, return = %d\n", rv);
return(ENOMEM);
}
vm->vm_dsize += btoc(diff);
} else if (diff < 0) {
diff = -diff;
rv = vm_deallocate(&vm->vm_map, new, diff);
if (rv != KERN_SUCCESS) {
uprintf("sbrk: shrink failed, return = %d\n", rv);
return(ENOMEM);
}
vm->vm_dsize -= btoc(diff);
}
return(0);
}
/*
* Enlarge the "stack segment" to include the specified
* stack pointer for the process.
*/
int
grow(p, sp)
struct proc *p;
vm_offset_t sp;
{
register struct vmspace *vm = p->p_vmspace;
register int si;
/*
* For user defined stacks (from sendsig).
*/
if (sp < (vm_offset_t)vm->vm_maxsaddr)
return (0);
/*
* For common case of already allocated (from trap).
*/
if (sp >= USRSTACK - ctob(vm->vm_ssize))
return (1);
/*
* Really need to check vs limit and increment stack size if ok.
*/
si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize);
if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
return (0);
vm->vm_ssize += si;
return (1);
}
/* ARGSUSED */
int
sys_ovadvise(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
#if 0
struct sys_ovadvise_args /* {
syscallarg(int) anom;
} */ *uap = v;
#endif
return (EINVAL);
}
int
vm_coredump(p, vp, cred, chdr)
struct proc *p;
struct vnode *vp;
struct ucred *cred;
struct core *chdr;
{
register struct vmspace *vm = p->p_vmspace;
register vm_map_t map = &vm->vm_map;
register vm_map_entry_t entry;
vm_offset_t start, end;
struct coreseg cseg;
off_t offset;
int flag, error = 0;
if (!map->is_main_map) {
#ifdef DEBUG
uprintf(
"vm_coredump: %s map 0x%lx: pmap=0x%lx,ref=%d,nentries=%d,version=%d\n",
(map->is_main_map ? "Task" : "Share"),
(long)map, (long)(map->pmap),
map->ref_count, map->nentries,
map->timestamp);
#endif
return EIO;
}
offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize;
for (entry = map->header.next; entry != &map->header;
entry = entry->next) {
if (entry->is_a_map || entry->is_sub_map) {
#ifdef DEBUG
uprintf(
"vm_coredump: entry: share=0x%lx, offset=0x%lx\n",
(long) entry->object.share_map,
(long) entry->offset);
#endif
continue;
}
if (entry->object.vm_object &&
entry->object.vm_object->pager &&
entry->object.vm_object->pager->pg_type == PG_DEVICE) {
#ifdef DEBUG
printf("vm_coredump: skipping dev @ %lx\n", (unsigned long)entry->start);
#endif
continue;
}
if (!(entry->protection & VM_PROT_WRITE))
continue;
start = entry->start;
end = entry->end;
if (start >= VM_MAXUSER_ADDRESS)
continue;
if (end > VM_MAXUSER_ADDRESS)
end = VM_MAXUSER_ADDRESS;
if (start >= (vm_offset_t)vm->vm_maxsaddr) {
flag = CORE_STACK;
start = trunc_page(USRSTACK - ctob(vm->vm_ssize));
if (start >= end)
continue;
} else
flag = CORE_DATA;
/*
* Set up a new core file segment.
*/
CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag);
cseg.c_addr = start;
cseg.c_size = end - start;
error = vn_rdwr(UIO_WRITE, vp,
(caddr_t)&cseg, chdr->c_seghdrsize,
offset, UIO_SYSSPACE,
IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
if (error)
break;
offset += chdr->c_seghdrsize;
error = vn_rdwr(UIO_WRITE, vp,
(caddr_t)cseg.c_addr, (int)cseg.c_size,
offset, UIO_USERSPACE,
IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
if (error)
break;
offset += cseg.c_size;
chdr->c_nseg++;
}
return error;
}
|